Why was the battle of Thermopylae considered to be a turning point of the Persian War?

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The Battle of Thermopylae took place at Thermopylae. Greeks were able to hold off Persian invaders for 3 days until a Greek traitor showed the Persians a way over the mountains. ... Xerxes' defeat was a turning point in history because it ensured that Greek culture could continue to thrive in the west.

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asked for and recieved from the united states